C hello world example on how to listen on a message queue and respond to messages

https://github.com/openiap/chellofn.git

getting started

compile and run in debug mode

make will automaticly download clib_openiap.h and binary for current platform, if you cannot use make you need to, go to rustapi and download library for your platform and place them in the lib folder, and rename it to libopeniap_clib.so

setup default credentials
```bash
export apiurl=grpc://grpc.app.openiap.io:443
# username/password
export OPENIAP_USERNAME=username
export OPENIAP_PASSWORD=password
# or better, use a jwt token ( open https://app.openiap.io/jwtlong and copy the jwt value)
export OPENIAP_JWT=eyJhbGciOiJI....

make && ./hello_client
# or with gcc directly
gcc main.c -Llib -lopeniap-linux-x64 -Wl,-rpath=lib -o hello_client && ./hello_client

# to static linked, use
make STATIC=1 && ./hello_client

# using nixos? Then path will be break inside docker, so we can use patchelf to "fix" it
make dockerbuild